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Shrinking Database Files Automatically
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SQL Server 2005 enables you to set a database option that allows the database engine to automatically shrink databases that have free space. When you set the ALTER DATABASE AUTO_SHRINK option to ON, the database engine periodically examines the database s space usage and reduces the size of the database files for that database.
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Be careful when allowing AUTO_SHRINK
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The AUTO_SHRINK option is set to OFF by default, and you should take care when setting this option to ON. Although the shrink process takes place in the background and does not affect users in the database, the process of shrinking a database can consume system resources, which can degrade the performance of the server. Also, continually shrinking and regrowing a database can lead to fragmentation at the file level, which often cannot be easily addressed in today s 24 x 7 database environments.
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Using Transact-SQL to Manage Databases
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When you need to shrink a database, transaction log, or single database file to recover unused space, it is often a better choice to manually shrink the file rather than to let SQL Server 2005 perform the operation automatically. Manually shrinking the database or database files enables you to choose when the shrink operation takes place, which can dramatically reduce the pressure that the shrink operation can cause on system resources.
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BEST PRACTICES
Shrinking databases
As with the automatic shrink setting, the manual shrink process takes place in the background and does not affect users in the database, but the process of shrinking a database can consume system resources and degrade server performance. Also, as with auto shrinks, continually shrinking and regrowing a database can lead to fragmentation at the file level, which can be difficult to fix in busy database environments. DBAs should perform database shrink operations or transaction log shrink operations (covered in a moment) only when they are certain that the unused space being reclaimed will not be needed in the future.
You can manually shrink databases and database files by using the DBCC SHRINKDATABASE statement or the DBCC SHRINKFILE statement, respectively. Note that when using the DBCC SHRINKDATABASE statement, you cannot shrink a database to a size that is smaller than its original size. You also cannot shrink a database file smaller than the used portion of the database. For example, unless you use the DBCC SHRINKFILE statement against the individual database files, you cannot shrink a database created with a size of 100 GB to below 100 GB, even if the database contains only 50 MB of data.
MORE INFO
DBCC SHRINKDATABASE and DBCC SHRINKFILE
For full details about executing the DBCC SHRINKDATABASE and DBCC SHRINKFILE statements, see the SQL Server 2005 Books Online topics DBCC SHRINKDATABASE (Transact-SQL) and DBCC SHRINKFILE (Transact-SQL), respectively.
Shrinking the Transaction Log
Database transaction logs are created with fixed boundaries in which you can shrink a transaction log file. The size of the virtual log files contained within the transaction log determines the reduction in size that is possible when shrinking the transaction log. This means that you cannot shrink the transaction log to a size less than the virtual log
Lesson 3: Shrinking Files
file. Take, for example, a transaction log file that is 10 GB in size and that contains 50 virtual log files, each 200 MB in size. Let s say that shrinking the transaction log would delete unused virtual log files but leave at least two virtual log files intact. In this example, you could shrink the transaction log file only to 400 MB the size of the two remaining virtual log files. Also note that any virtual log files that are still active and contain uncommitted transactions or unwritten operations will not be part of the shrink process.
Quick Check
How can you shrink a database without having to shrink each file individually DBAs wanting to shrink an entire database can issue the DBCC SHRINKDATABASE statement against the database.
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